Knoll 21K manual

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- informations concerning technical data of Knoll 21K
- name of the manufacturer and a year of construction of the Knoll 21K item
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- safety signs and mark certificates which confirm compatibility with appropriate standards

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Table of contents for the manual

  • Page 1

    21K S tereo am plifier speci ficati ons Inputs: Gold RCA jacks with adjustabl e gain Input impedance: 50k ohms Outputs: 5 way gold insul ated binding posts Output power: 90 watts RMS per chan nel (8 ohms) Ideal imp edance: 4 – 8 ohms Frequency response: 10 Hz – 40 kHz +/- 1dB S/N ratio: Over 106 dB A weigh ted (90 watts) THD distortion: Less th[...]

  • Page 2

    Important Safet y Instructi ons: 1) Read these instructions. 2) Keep these instructions. 3) Read all warnings. 4) Follow all instructions. 5) Do not use this apparatus near water. 6) Clean only with dry cloth. 7) Do not block any ventilation openings. Install i n accordance with the manufacturer’s instructions. 8) Do not install near any heat sou[...]

  • Page 3

    Do not use thi s amplifier near water includin g near a bathtub, swimming pool or hot tub . This unit should be i nstalled so that its locati on does not interfere with proper v entilation. For example, d on’t place the amplifier on a bed, sofa , rug, or simil ar surface that may block the ventila tion openings; or place in a buil t-in installati[...]

  • Page 4

    Hum and noi se In most cases, one of th e following suggestions should help you solve a hum noise in your system. Please try th ese steps in the order shown; proceedi ng from one step to the next if the prior suggestion does not elim inate the problem. Potential ground loops i n a co mplex A /V system Suggestion #1 To determine if a cabl e TV conne[...]

  • Page 5

    Getting to know the rea r panel A. Audio Inputs Use the INPUT jacks to conne ct the outputs of a preamplifier, receiver wi th pre-out connecti ons, CD player, or other control devices. B. Inp ut Gain Controls Use these to adjust the i nput gain of each chan nel. C. Pro duct Serial Numb er Write this numb er in the space provided on page “” for [...]

  • Page 6

    turn off, check your speake rs to verify that they are operating properly. If all other pot ential sources of troubl e check out properly, contact Knoll for further assistance. Knoll System s se rvice informati on The 21K ampli fier does not contain any user servi ceable parts inside. If you suspect a problem that may requi re servicing, contact us[...]

  • Page 7

    speaker cones will be moving in, whil e others move out. This will cause indi stinct or confusing imaging, and muddled and cloudy sounds. To avoi d incorrect phasing or polarity, be sure to use wire that has disti nct marking s, colors, stripes, wording, or grooves on each si de of the speaker cable. When making connections to the amp and speakers,[...]

  • Page 8

    When installin g, make sure the 21k front panel power swit ch is in the out or “OFF” positi on. Plug the DC adapte r into a switched outlet on the source devi ce that will be activat ed when you want to have the ampli fier turn on. This may be the swi tched outlet at the rear of an AC recei ver or other audi o equipment. Connect the 3.5mm mini [...]